A person commits Perjury when he makes a promise under oath with no intention of keeping it, or when after promising on oath he does not keep it. Perjury is a grave lack of respect for the Lord of all speech. Pledging oneself by oath to commit an evil deed is contrary to the holiness of the divine name.

False witness and Perjury. When it is made publicly, a statement contrary to the truth takes on a particular gravity. In court it becomes false witness. 275 When it is under oath, it is perjury. Acts such as these contribute to condemnation of the innocent, exoneration of the guilty, or the increased punishment of the accused. 276 They gravely compromise the exercise of justice and the fairness of judicial decisions.